Oppose them in every state they attempt to be admitted to the Bar.
In most states regular folk can present a case to not admit and bring evidence of unfitness. Stop them. Stop them now.
My daughter graduated Law School last year. Has passed the Bar in two states and had to jump though all kinds of hoops to get the licenses. In addition to passing the bar, she was required to pass ethics tests, criminal background checks, be finger printed and finally be recommended by a bar member in good standing.
No way in hell should any criminal illegal be allowed to practice law in the USA.